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Zoology and wildlife conservation

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Neutron scattering from magnetic excitations in Bi2Sr2CaCu2O8+delta

Article Abstract:

It has been possible to observe a magnetic resonance peak in the superconducting state in inelastic neutron scattering measurements of the copper oxide system Bi2Sr2CaCu2O8+delta. The magnetic excitation spectra of Bi2Sr2CaCu2O8+delta and YBa2Cu3O7 show a clear similarity. In the superconducting state, the magnetic intensity is strongly focused around a single point in energy and wavevector. The intensity is too broad or too weak to be seen above background in the normal state.

Author: Sidis, Y., Koshizuka, N., Gu, G.D., Bourges, P., Keimer, B., Fong, H.F., Regnault, L.P., Ivanov, A.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
Neutrons, Neutron diffraction, Magnetic resonance

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Quantum magnetic excitations from stripes in copper oxide superconductors

Article Abstract:

Superconductivity in copper oxide appears when mobile 'holes' are doped into the insulating state, and it coexists with antiferromagnetic fluctuations. In order to describe the coexistence, the holes are believed to self-organize into 'stripes' that alternate with antiferromagnetic (insulating) regions within copper oxide planes that would necessitate an unconventional mechanism of superconductivity.

Author: Perring, T.G., Tranquada, J.M., Woo, H., Goka, H., Gu, G.D., Xu, G., Fujita, M., Yamada, K.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
Superconductivity, Properties

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Two-dimensional geometry of spin excitations in the high-transition-temperature superconductor YBa2Cu3O(super 6+x)

Article Abstract:

Copper oxide superconductors are built on a Cu4O4 plaquette. There is a debate over the geometry of the two-dimensional magnetic fluctuations that appear in rigid stripe arrays in YBa2Cu3O(super 6+x).

Author: Bernhard, C., Sidis, Y., Lin, C.T., Hinkov, V., Kulakov, A., Bourges, P., Pailhes, S., Keimer, B., Ivanov A., Kulakov A., Chen, D.P.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Yttrium & Compounds, Electric properties, Arrays (Data structures), Magnetic properties, Molecular rotation, Yttrium compounds

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Subjects list: Research, United States, Copper oxide superconductors
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